Code Definition

B2571 — Left Lamp Outage Signal Circuit Short to Ground

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B2571

B2571 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2571 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B2571 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Lighting Control Module (LCM) or Body Control Module (BCM) monitors the exterior lamp circuits for outages and provides a warning signal to the instrument cluster when a lamp failure is detected. DTC B2571 sets when the module detects that the left lamp outage signal circuit, which carries the lamp failure warning to the instrument cluster, has a short to ground condition. The signal is typically a discrete or multiplexed line that the cluster reads to illuminate the lamp out warning indicator on the dash. When this code is set the lamp out telltale may stay illuminated continuously, fail ...

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